Allennes-les-Marais (French pronunciation: [al'ɛn le maʁ'ɛ]) is a commune in the Nord department in northern France.

Historical population

Year Pop. ±% p.a. 1793 547 —     1821 733 +1.05% 1846 870 +0.69% 1872 1,021 +0.62% 1901 1,175 +0.49% 1926 1,145 −0.10% 1946 1,142 −0.01% 1962 1,658 +2.36%	Year Pop. ±% p.a. 1968 1,837 +1.72% 1975 1,893 +0.43% 1982 2,426 +3.61% 1990 2,773 +1.69% 1999 3,234 +1.72% 2007 3,393 +0.60% 2012 3,357 −0.21% 2017 3,460 +0.61%
Source: EHESS and INSEE (1968-2017)

The arms of Allennes-les-Marais are blazoned : Or, 10 lozenges conjoined gules 3,3,3 and 1.

Allennes-les-Marais is twinned with:

• Białobrzegi, Poland

• Communes of the Nord department